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WBPAT for FDTD simulation of microwave devices with homogeneous waveport

机译：WBPAT用于均匀波口微波设备的FDTD仿真

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摘要

Accurate power-to-amplitude transformation (PAT) has been proposed for the continuous wave (CW, i.e. sinusoidal wave or multi-carrier) to stimulate the quantitative electromagnetic fields under specified average input power with the finite-difference time-domain (FDTD) method for simulation of microwave devices. In this study, the authors propose wideband PAT (WBPAT), by which quantitative amplitude and phase of electromagnetic fields at desired frequencies can be accurately extracted for microwave devices with homogeneous waveport under specified average input power when the excitation waveform of specified waveguide mode is wideband impulse signal. In the proposed WBPAT, the information of incident wave for normalisation is needed, which is investigated and discussed. Furthermore, a post-processing procedure called as the mode-impedance-modified normalisation is proposed to consider the frequency dependence of mode impedance, in which the mode impedance in wideband is obtained by FDTD simulation, per se. The average input power is defined for each frequency within the frequency range. As a result, accurate amplitude and phase, which is equivalent to that by frequency-domain methods or TD methods with the excitation of CW after steady state, can be extracted. Several numerical examples show the validity of the proposed method.
机译：对于连续波（CW，即正弦波或多载波），已经提出了精确的功率-幅度转换（PAT），以在有限的时域（FDTD）下在指定的平均输入功率下激发定量电磁场微波设备的仿真方法。在这项研究中，作者提出了宽带PAT（WBPAT），当指定波导模式的激励波形为宽带时，通过该方法可以准确地提取具有均一波口的，在指定平均输入功率下的微波设备在所需频率下的定量振幅和相位。脉冲信号。在提出的WBPAT中，需要将入射波的信息进行归一化，对此进行了研究和讨论。此外，提出一种称为模式阻抗修正归一化的后处理程序，以考虑模式阻抗的频率依赖性，其中通过FDTD仿真获得宽带中的模式阻抗本身。为频率范围内的每个频率定义了平均输入功率。结果，可以提取出精确的振幅和相位，该振幅和相位与在稳态后激发连续波的频域方法或TD方法等效。几个数值算例表明了该方法的有效性。

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